HFP-100R fuel preheater is a free-standing unit. It is designed to preheat heavy fuel as it flows from a fuel storage tank to the burner of an aggregate dryer at a
HMA plant. Preheating lowers the viscosity of the fuel so it can be properly atomized by the burner.
The preheater heats the fuel to its optimum temperature for atomization. The preheater is controlled precisely to maintain that temperature within one or two degrees. The unit can raise the fuel temperature 100 degrees above its storage temperature at a flow rate of 1,000 gallons per hour.
The fuel is heated as it flows around the outside of finned coils in the unit. The finned coils are heated by thermal fluid that flows inside the finned coils. The thermal fluid must be provided by an external source such as a thermal fluid heater (not included). For optimal performance, the heater should be installed in an independent hot oil circuit with its own hot oil pump.
The main components of the fuel preheater are:
- Heating coils
- Control panels
- Piping and valves
The shell of the fuel preheater is made from schedule 40 steel pipe, 12-inches in diameter. One end has a welded pipe cap. The other end is flanged and has a removable head that is bolted in place. The shell has two saddles that support the heater. The saddles are flanged at the bottom and predrilled for mounting bolts. Two lifting lugs are incorporated to facilitate lifting either the entire unit or the removable head with coils attached. One lug is welded to the shell. The other is welded to the removable head.
The shell is covered with 1-1/2 inches of pipe insulation. One end of the shell is also insulated.
The shell is covered with 0.032-inch aluminum skin to protect the insulation. The skin has a baked-on ivory finish that is durable, long-lasting and virtually maintenance-free.
The heating coils are made from 1-1/4 inch diameter, schedule 40 pipe. The coils have serrated fins, which increase the heating surface of the pipe about 800 percent more than bare pipe. The serrations of the fins increase efficiency of heat transfer by increasing